An antigen is a substance either foreign or internal that triggers an immune response. This response is triggered by a histocompatibility molecule within each cell that can trigger an immune response.
C'mon, it's obviously A. Antigens are like the supervillains of the body - they're here to cause trouble, not help with digestion or muscle movement. I bet the person who wrote this question was feeling a little 'antsy' that day.
Desiree
2 months agoLynelle
2 months agoDevora
21 days agoCasie
22 days agoAileen
26 days agoGlory
2 months agoAlpha
2 months agoWalker
2 months agoAltha
1 months agoMelina
2 months agoVeronica
2 months agoSueann
2 months agoAlbina
3 months agoJesusa
2 months agoLuis
2 months agoGary
2 months agoStevie
2 months agoWilda
2 months ago